XML use is widespread across modern information systems in all industry,
government and academic sectors. The core technologies for processing XML
(XML, XSLT, XPath, XML Schema and others) are maturing steadily — thanks
to support from standards bodies like the W3C and OASIS, and from major industry
players such as IBM, Microsoft, and Oracle, XML is also the basis for a growing
body of industry standards for data exchange, and it is well on its way to becomming
a mainstream technology for data integration. XML is transforming not just data —
it is transforming information processing in general.

XQuery and SQL/XML are two standards that use declarative, portable queries to return XML by querying data. In both standards, the XML can have any desired structure, and the queries can be arbitrarily complex. XQuery is XML-centric, while SQL/XML is SQL-centric.
This white paper provides an introduction these native XML programming languages and demonstrates how they are
very efficient for simplifying a many common XML programming tasks.

A sample chapter of XQuery From the Experts (Addison-Wesley). This chapter gives a high-level introduction to the XQuery language by
presenting a series of examples, each of which illustrates an important feature of the language and shows how it is used in practice. (PDF, 0.34MB)

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